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kimikimono
1 Posts |
 Posted - 12/22/2010 : 5:47:39 PM
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Origin Ver. and Service Release (Select Help-->About Origin): 8.0 SR0
Operating System:W7
Hello everybody 
I'm trying to fit peak curves with the following expressions:
y=((2*3,1416*(ct-1))^(-0,5))*x/exp((-(x-1)^2)/(2*(ct-1))), and
y=ln((x*(ct^(0,5))/(x*ln(ct))))*((ct/(2*3,1416*ln(ct)))^(0,5))*(exp(-0,5*(ln(x*(ct^0,5)))^2)/(ln(ct)))/(exp(0,5*ln(ct))),
being just y=f(x) and ct a constant value that I must set, not even iterate it...
Those functions should work since I actually obtained "y" data from them (then, this is a double-checking for the equations). Nor the curve-fitting tool neither the simulation works
Any clue???
Thanks a lot
Jose |
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minimax
348 Posts |
Posted - 12/29/2010 : 07:45:29 AM
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Hi Jose,
Comma can not be used as numeric separator in function definition in any OS.
You need to use dot "." instead, like
y=((2*3.1416*(ct-1))^(-0.5))*x/exp((-(x-1)^2)/(2*(ct-1)))
y=ln((x*(ct^(0.5))/(x*ln(ct))))*((ct/(2*3.1416*ln(ct)))^(0.5))*(exp(-0.5*(ln(x*(ct^0.5)))^2)/(ln(ct)))/(exp(0.5*ln(ct)))
Max
OriginLab Technical Support |
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Non-linear Curve fitting problems